It’s a pretty large part—somewhere between a third and half—just not a majority.
I was also tracking that specific hypothesis, which was why I specifically flagged “about 25% of IQ variability (using a method which does not require identifying all the relevant SNPs, though I don’t know the details of that method)”. Again, I don’t know the method, but it sounds like it wasn’t dependent on details of the regression methods.
Half-informed take on “the SNPs explain a small part of the genetic variance”: maybe the regression methods are bad?
Two responses:
It’s a pretty large part—somewhere between a third and half—just not a majority.
I was also tracking that specific hypothesis, which was why I specifically flagged “about 25% of IQ variability (using a method which does not require identifying all the relevant SNPs, though I don’t know the details of that method)”. Again, I don’t know the method, but it sounds like it wasn’t dependent on details of the regression methods.